A DEVICE FOR CALCULATING A PRESSURE DIFFERENCE AND A METHOD OF CALCULATING A PRESSURE DIFFERENCE BETWEEN THE INPUT AND OUTPUT FILTER PARTS, AND ALSO THE DEVICE FOR CALCULATING THE DEPOSIT AMOUNT AND THE METHOD FOR CALCULATING THE QUANTITY OF A QUANTITY

摘要

1. A pressure drop calculator for calculating the pressure drop between the inlet and outlet of a filter in an exhaust gas purification system, said exhaust gas purification system includes a filter that is located in the exhaust duct of an internal combustion engine and captures particulate matter emitted from the engine internal combustion, characterized in that it contains:! pressure detecting means for detecting the pressure upstream of the filter; ! pressure estimation means for estimating the pressure downstream of the filter from the total pressure loss in the exhaust duct on the downstream side of the filter; and! calculating means for calculating the pressure drop between the inlet and the outlet of the filter based on the determined pressure upstream of the filter and the estimated pressure downstream of the filter. ! 2. The device for calculating the pressure drop according to claim 1, in which:! the pressure estimator estimates the downstream pressure of the filter by adding the total pressure loss to atmospheric pressure. ! 3. A pressure drop calculator for calculating the pressure drop between the inlet and outlet of a filter in an exhaust gas purification system, said exhaust gas purification system includes a filter that is located in the exhaust duct of an internal combustion engine and captures particulate matter emitted from the internal engine combustion, and an exhaust throttle valve, which is located in the exhaust duct on the outlet side of the filter and controls the cross-sectional area of the exhaust duct, characterizing